MySQL 5.7: Trouble with GROUP BY clause not aggregating correctly when using CASE statements
I keep running into I'm writing unit tests and I'm experiencing an scenario with a MySQL 5.7 query where I'm trying to use a `GROUP BY` clause along with `CASE` statements, but it seems that the aggregation is not behaving as expected. Specifically, I want to count the number of users by their status, which is determined by their last_login date. My current query looks like this: ```sql SELECT CASE WHEN last_login > NOW() - INTERVAL 30 DAY THEN 'Active' ELSE 'Inactive' END AS user_status, COUNT(*) AS user_count FROM users GROUP BY user_status; ``` However, the result is not what I expect; it's returning multiple rows for each status instead of a single count per status. I checked my data, and it seems fine. I also tried simplifying the `CASE` statement to just return a static value, and the aggregation worked as expected: ```sql SELECT 'Static' AS user_status, COUNT(*) AS user_count FROM users GROUP BY user_status; ``` This led me to think that maybe the `CASE` logic is causing some unexpected grouping behavior. I'm not seeing any behavior messages, but the output is inconsistent with my expectations. I've also ensured that all relevant fields are indexed properly to optimize performance. Are there any nuances with `GROUP BY` and `CASE` statements in MySQL that I might be missing? Any help would be greatly appreciated! Has anyone dealt with something similar? How would you solve this?